import { Context, Effect, Layer } from "effect"
import { Server } from "node:http"
import { ServerConfig } from "../ServerConfig"
import { ExpressApp } from "./ExpressApp"


export class ExpressHTTPServer extends Context.Tag("ExpressHTTPServer")<ExpressHTTPServer, Server>() {}

export module ExpressHTTPServer {
    export const Live = Layer.effect(ExpressHTTPServer, Effect.acquireRelease(
        Effect.gen(function*() {
            const app  = yield* ExpressApp
            const port = yield* ServerConfig.httpPort

            return yield* Effect.async<Server>(resume => {
                const server = app.listen(port, () => resume(
                    Effect.succeed(server).pipe(
                        Effect.tap(Effect.logInfo(`HTTP server listening on ${ port }`))
                    )
                ))
            })
        }),

        server => Effect.gen(function*() {
            yield* Effect.logInfo("HTTP server is stopping. Waiting for existing connections to end...")
            yield* Effect.async(resume => {
                server.close(() => resume(Effect.logInfo("HTTP server closed")))
            })
        }),
    ))
}